The book is now available! 919
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This prime is the 18th centered hexagonal number. Note that we can use the digits of 919 to write 18 = (9 * 1) + 9 = 9 + (1 * 9). [Post]

 

  Submitted: 2004-10-06 05:30:51;   Last Modified: 2008-01-30 11:28:00.



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